Switch the inheritance of WebViewClient from WebWidgetClient to protected.

third_party/WebKit/Source/web/tests/RootScrollerTest.cpp

Index: third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp b/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
index 70f4f792caa064a522635e0a4ffb992ba30ee37b..4c6abf7c2e9d55750cee501094d7cb3bf325cb67 100644
--- a/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
+++ b/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
@@ -59,7 +59,8 @@ public:
         // Load a page with large body and set viewport size to 400x400 to
         // ensure main frame is scrollable.
         m_helper.initializeAndLoad(
-            m_baseURL + pageName, true, 0, &m_client, &configureSettings);
+            m_baseURL + pageName, true, nullptr, &m_client, nullptr,
+            &configureSettings);
 
         // Initialize top controls to be shown.
         webViewImpl()->resizeWithTopControls(IntSize(400, 400), 50, true);